Star Wars: Rogue One might feature a version of Darth Vader you weren't expecting

Okay, so you're in then? Here we go. A recently released featurette on the creatures in Rogue One featured this man testing out some furry alien legs:

Which is nice and everything until you zoom in a bit and realise there's concept art and a model of a man wearing a mask with his arms missing.

Now who do we know in the Star Wars universe that had their arms and legs cut off?

Oh, yeah. In retrospect: such a dumb move. Anyway, cutting arms off leads to burning in lava, burning in lava leads to cool PVC suits, and cool PVC suits might need convalescing in Bacta tanks. Which means the model of what looks like Stumpey Vader might explain this shot we noticed from the original Rogue One trailer a while back:

At the time we thought it might be the Emperor (those are his personal guard in the red for example) but we weren't sure who was in the tube. That model up there would seem to confirm it's Vader. Presumably, his burns need constant treatment? Or maybe there's an overlap on the timings, as we know some of Rogue One is takes place at an earlier time, and part of the film takes place at the end of the prequels.

Here's the full creature features if you fancy it:

Directed by Gareth Edwards and starring Felicity Jones, Diego Luna, Ben Mendelsohn, Forest Whitaker, and Mads Mikkelsen, Rogue One: A Star Wars Story is released in the UK on December 15 and the US on December 16.